Characterizing library for emerging 2DFETs with in-house .va based models

Hi All,

I am trying to use Liberate to characterize logic gates with in-house (lab developed) Verilog-A based models. Since I am new to Liberate, I am having difficulty in getting a successful characterization. I am working on the examples logic gates INV and NOR provided with Liberate, while the device model is my own. I would like the external simulator that is called by Liberate to be HSPICE. I am shown LIB-14 error: cannot open file. 

I am not sure if I have followed the correct procedures/if there is an issue with using the Verilog-A file. Please guide me with this.

Below is my.tcl file:

# Liberate Example Tcl File

# Set the run directory. Here we use PWD, but in a distributed
# environment, it is recommended to directly specify the full path
# instead of using "PWD"
set rundir $env(PWD)

# Create the directories Liberate will write to.
exec mkdir -p ${rundir}/LDB
exec mkdir -p ${rundir}/LIBRARY
exec mkdir -p ${rundir}/DATASHEET

### Define temperature and default voltage ###
set_operating_condition -voltage 1.5 -temp 27

## Load template information for each cell ##
source ${rundir}/TEMPLATE/template_example.tcl

## Load Spice models and subckts ##
set_var extsim_cmd hspice
set_var extsim_cmd_option +spice
#set_var extsim_deck_header "simulator lang=spectre\nOpt1 options reltol=1e-4\nsimulator lang=spice"

set_var extsim_option "runlvl=5"
set_var extsim_leakage_option "gmindc=1e-14 pivtol=1e-15"
set_var extsim_save_failed all
set_var extsim_model_include "/home/min/a/nthakuri/Research/Liberate_Example_NT/MODELS/Bot_gate.va"
define_leafcell -extsim_model -type nmos -pin_position {0 1 2 3} {M1fet_ch1}

#set spicefiles $rundir/MODELS/include_SS.sp
foreach cell $cells {
lappend spicefiles ${rundir}/NETLIST/${cell}.sp
}
read_spice $spicefiles

## Characterize the library for NLDM (default), CCS and ECSM timing.
set_var extsim_deck_dir "/home/min/a/nthakuri/Research/Liberate_Example_NT/decks"

char_library -ecsm -ccsn -ccsp -extsim hspice -cells ${cells}

## Save characterization database for post-processing ##
write_ldb ${rundir}/LDB/example.ldb

## Generate a .lib with ccs, ecsm ###
write_library -overwrite -ccs ${rundir}/LIBRARY/example_ccs.lib
write_library -overwrite -ecsm ${rundir}/LIBRARY/example_ecsm.lib

## Generate ascii datatsheet ###
write_datasheet -format text ${rundir}/DATASHEET/example

The simulation log is as follows:

LIBERATE started on xxx at Tue Jul 23 10:06:44 2019

Command line arguments: none.
ALTOSHOME set to '/package/eda/cadence/LIBERATE181'.
Server ID : T20190723100644952460S0309983
liberate > source char.tcl
LIBERATE parameter "slew_lower_rise" set to "0.3"
LIBERATE parameter "slew_upper_rise" set to "0.7"
LIBERATE parameter "slew_lower_fall" set to "0.3"
LIBERATE parameter "slew_upper_fall" set to "0.7"
LIBERATE parameter "measure_slew_lower_rise" set to "0.3"
LIBERATE parameter "measure_slew_upper_rise" set to "0.7"
LIBERATE parameter "measure_slew_lower_fall" set to "0.3"
LIBERATE parameter "measure_slew_upper_fall" set to "0.7"
LIBERATE parameter "max_transition" set to "1.5e-09"
LIBERATE parameter "extsim_cmd" set to "hspice"
LIBERATE parameter "extsim_cmd_option" set to "+spice"
LIBERATE parameter "extsim_option" set to "runlvl=5"
LIBERATE parameter "extsim_leakage_option" set to "gmindc=1e-14 pivtol=1e-15"
LIBERATE parameter "extsim_save_failed" set to "all"
LIBERATE parameter "extsim_model_include" set to "/home/min/a/nthakuri/Research/Liberate_Example_NT/MODELS/Bot_gate.va"
INFO (LIB-511): (define_leafcell): Leafcell 'M1fet_ch1' (instance) has been identified with pin_position (0 1 2 3) mapped to (D G S B).
LIBERATE parameter "extsim_exclusive" set to "1"
LIBERATE parameter "extsim_flatten_netlist" set to "0"
LIBERATE parameter "spectre_pwr" set to "0"
LIBERATE parameter "extsim_deck_dir" set to "/home/min/a/nthakuri/Research/Liberate_Example_NT/decks"
LIBERATE parameter "simulator" set to "hspice"
LIBERATE parameter "spectre_use_char_opt_license" set to "0"
LIBERATE parameter "char_library_skip_var_list" set to ""
Start Characterizing Library at (Tue Jul 23 10:06:54 EDT 2019)

ERROR (LIB-14): Could not open file (file=/home/min/a/nthakuri/Research/Liberate_Example_NT/MODELS/Bot_gate.va).
*Error* Liberate exits now, please fix the reported parser problem(s).
Peak memory usage: 335 MB
Peak virtual memory usage: 300 MB
Peak physical memory usage: 35 MB
Wall time : 0.00 hours (10.00 seconds)
LIBERATE exited on xxx at Tue Jul 23 10:06:54 2019

Thanks,

Niharika